Black screen after video plays?

Hello,

I have uploaded a 17 second mp4 video into power point with articulate.

When I preview the video a black screen runs for an extra 15 seconds or so making the total running time of my video 30 seconds, when it is only 17 seconds or so. Is there a minimum length that your video can be? The black screen does not play when the video is viewed normally.

Thanks for your help!

Sarah

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